Blog

The plots below represent partial phase diagram representing vapor pressure vs. temperature curves for diethyl ether (CH3CH2-O- CH3CH2), ethanol (CH3CH2-OH), liquid mercury (Mercury is the only liquid metal), and water, not necessarily in that order.   Answer the following questions based on the diagram:  a) which is the most likely vapor pressure vs. temperature curve for diethyl ether (CH3CH2-O- CH2CH3)? b) Arrange the four compounds in the order of increasing boiling points. Use the names or the formulas to show your answer.

Use the diagram below to answer the following questions. What phases can be present at 200°C and 0.75 atm pressure?

Mercury rises in a glass tube faster than water.True False

Only molecules which do not have dipole moments can experience dispersion forces. True False

Acetone (CH3-CO-CH3) will be miscible with chloroform (CHCl3) and the strongest intermolecular forces between the solute and the solvent will be dipole-dipole forces.True False

which of the following substances will have the greatest polarizability (higher dispersion forces)?

Stainless steel which is an alloy is an example of a ________ solution.

How many moles of ions (particles) are present in 1.0 L of 0.5 M Li2SO4 (lithium sulfate)?

The following partial phase diagram shows a close-up view of the vapor pressure curves (liquid-vapor equilibrium curve) for a pure solvent and a solution containing a nonvolatile solute dissolved in this solvent. Which curve is the solvent and what happens to the boiling point when the solute is dissolved in the solvent?

The enthalpy of vaporization for ethanol is 39.3 kJ/mol.  The vapor pressue for ethanol at 34.9 oC is 100 mmHg.  What is the normal boiling point of ethanol if the atmospheric pressure is 740 mm Hg.  Show your work to receive credit. You can use the Clausius-Clayperon 2-point equation: